Most Common Types of VNA Calibration Procedures vs OML Cal Kit Components

Millimeter Wave Waveguide VNA Calibration Procedures vs. OML Cal Kit Components

Detailed below are the OML Cal Kit components applicable to the most common waveguide VNA calibration procedures. (A pdf file of this chart is available for download.)

Acronym		Description	OML Cal Kit Components (WR-12 example)
*Two Port Calibrations*
1)	LRL	Line / Reflect (short) / Line	OS-12 / S-12 / OS1/4-12
2)	LRM	Line / Reflect (short) / Match (Load)	OS-12 / S-12 / T-12
3)	TRL	Thru / Reflect (short) / Line	Thru / S-12 / OS-12 or OS1/4-12
4)	TRM	Thru / Reflect (short) / Match (Load)	Thru / S-12 / T-12
5)	TSD	Thru / Short / Delay	Thru / S-12 / OS-12 or OS1/4-12 or W/G-12
6)	OOLST	Offset Short / Offset Short / Load (sliding) / Thru	S-12 & OS1/4-12 / S-12 & OS-12 / AL-12 / Thru
7)	OOLFT	Offset Short / Offset Short / Load (fixed) / Thru	S-12 & OS1/4-12 / S-12 & OS-12 / T-12 / Thru
8)	SSLST	Offset Short / Short / Load (sliding) / Thru	S-12 & OS1/4-12 / S-12 & OS-12 / AL-12 / Thru
9)	SSLFT	Offset Short / Short / Load (fixed) / Thru	S-12 & OS1/4-12 / S-12 & OS-12 / T-12 / Thru
*One Port Calibrations*
10)	OOLF	Offset Short / Offset Short / Load (fixed)	S-12 & OS1/4-12 / S-12 & OS-12 / T-1
11)	OOLS	Offset Short / Offset Short / Load (sliding)	S-12 & OS1/4-12 / S-12 & OS-12 / AL-12
12)	SSLS	Offset Short / Short / Load (sliding)	S-12 & OS1/4-12 / S-12 & OS-12 / AL-12
13)	SSLO	Offset Short / Short / Load (fixed) / Offset Load (fixed)	S-12 & OS1/4-12 / S-12 & OS-12 / T-12 & OS-12 / T-12 & OS1/4-12
14)	SSS	Three different offset shorts (<180 deg. total)	S-12 / S-12 & OS-12 / S-12 & OS1/4-12
Notes:
Offset Short / Short vs Offset Short / Offset Short:		Both specify two shorts offset with ¼ wavelength difference
Thru vs Line vs Delay:		Thru is a connection of two modules of zero length with Test Port Adapters in place. Line inserts an additional waveguide section of precise known length. Delay is a Thru.
Load (fixed) or Match:		Definition is the same, procedure assumes a load return loss of >40 dB for a good calibration

Revised 1/18/2002

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